Substituent Effects and Charge Delocalization Mode in Chrysenium, Benzo[<i>c</i>]phenanthrenium, and Benzo[<i>g</i>]chrysenium Cations: A Stable Ion and Electrophilic Substitution Study
作者:Kenneth K. Laali、Takao Okazaki、Subodh Kumar、Sergio E. Galembeck
DOI:10.1021/jo001268b
日期:2001.2.1
disubstituted chrysenes Ch (5- methyl- 3, 2-methoxy- 19, 2-methoxy-11-methyl- 20, 2-methoxy-5-methyl- 21, and 9-methyl-4H-cyclopenta[def]chrysene 22), monosubstituted benzo[c]phenanthrenes BcPh (3-methoxy- 23, 3-hydroxy- 24), and monosubstituted benzo[g]chrysenes BgCh (12-methoxy- 25; 12-hydroxy- 26) were generated in FSO3H/SO2ClF or FSO3H-SbF5 (4:1)/SO2ClF and studied by low-temperature NMR at 500 MHz. The methoxy
A New and Concise Synthesis of 3-Hydroxybenzo[<i>c</i>]phenanthrene and 12-Hydroxybenzo[<i>g</i>]chrysene, Useful Intermediates for the Synthesis of Fjord-Region Diol Epoxides of Benzo[<i>c</i>]phenanthrene and Benzo[<i>g</i>]chrysene
作者:Subodh Kumar
DOI:10.1021/jo9712355
日期:1997.11.1
the hydroxy analogues 5 and 6, respectively. The availability of this short and high-yielding regiospecific method for the synthesis of phenols 5 and 6 should allow the preparative-scale synthesis of the fjord-region diol epoxides 3 and 4. These diol epoxides are required as starting compounds for the synthesis of site-specifically modified oligonucleotides which are critically needed to elucidate the